I think that concrete poetry seems to have, as far as I can see, come to a kind of a dead end. It doesn't seem to be going any further than it went in its high period of about five or six years ago.
I mean, the first 'Back to the Future' is kind of a perfect script, I think, in terms of handling time travel the best. It depends on your definition. To me, that means it effectively uses it in the story.

